21220202303 has 2 divisors, whose sum is σ = 21220202304. Its totient is φ = 21220202302.

The previous prime is 21220202257. The next prime is 21220202323. The reversal of 21220202303 is 30320202212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220202303 - 2²² = 21216007999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220202323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610101151 + 10610101152.

It is an arithmetic number, because the mean of its divisors is an integer number (10610101152).

Almost surely, 2^21220202303 is an apocalyptic number.

21220202303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220202303 is an equidigital number, since it uses as much as digits as its factorization.

21220202303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21220202303 its reverse (30320202212), we get a palindrome (51540404515).

Subtracting 21220202303 from its reverse (30320202212), we obtain a palindrome (9099999909).

The spelling of 21220202303 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, three hundred three".